Notice of certwin processes in the Arts. 361 
formed me that they appear to suffer no diminution or decay, 
butare liable to bend and break from the inten. 
tinuance of the heat. The whole produce of sulphuric acid 
is about 12,000 gallons weekly. 
The next process in order is the formation of the chicruteie 
lime. There are 15 or 20 leaden retorts for the evolution of 
the chlorine, about 5 feet in diameter, and weighing nearly 
three tons each. They are heated by steam, and the usi 
materials are employed for the production of the gas. With- 
in two years, the inconvenient apparatus formerly employed 
for the impregnation of the lime, has been greatly inproved 
by the ingenuity of Mr. Tennant, The gas the retorts, 
is passed into six chambers of hewn stone, about 30 feet long, 
20 wide, and 6 high, which are covered with wood and ren- 
red impervious tu the gas by a resinous varnish. The lime 
is placed i in shallow boxes at the bottom of these ehnasbets- 
It is os itty during the process by iron rakes, inserted 
with lime which serves as a valve. Thei impreg- 
nation is generally completed in two days, when the supply is 
renewed s of wooden doors which are luted in. So 
Bee os Se is goo part of the apparatus fitted, that i in 304 
building containing these immense volumes of imprisoned 
there was no disagreeable vapour, and the gas was ; not $0 
perceptible as it usually is in a laboratory where a small quan- 
tity is rng for mere experiment. The powder, when com- 
pletely nen even in large’ quantities, has no perceptible 
odour, and th us shows the accurate manner in which the ye 
cess is c ted. 
Mlle resednides Of thie establishment is em loyed in turnin; 
the residue of these processes to — Phe sul ates ¢ 
soda and potash are converted into the alkaline ane te by two 
successive burnings, in union with Siteurbeen coal, and three 
lixiviations and evaporations. About eighteen tons” of sub- 
’ carbonate of soda in its purified state are produced w 
By two successive crystallizations it is formed into furge 
rhomboidal tabular crystals, and surpasses in beauty any 
specimens of the article I have ever seen produced in the 
large we A part of the alkali is taken at an intermediate 
state, and employed in the last section of the manufactory, in 
the making of soap. Jt furnishes the chief supply of this arti- 
cle for this city and the surrounding country. Some idea 
may be formed of the extent of this establishment from the 
fact apg ake ap adaily bopply, of 60 tons of coal ‘add 20 tons 
